Recent Sign-in Activity - How do I see full list? What does "K" mean on the list of sign in methods?

Three questions really:

1.  When attempting to view Recent Sign-in Activity for my accounts, it implies at the top of the web page that you are able to "View your recent activity from the last 30 days."  This doesn't look to be the case though as it only allows you to view one page worth of sign-ins (the most recent 20 attempts).  Am I missing something?  How do I see the whole list? Also, is there a way to go back further than 30 days?

2.  For the secondary account that I was looking into that had the suspicious activity, there are multiple sign ins from a device listed only as "K."  What kind of device is this indicating?  Also, there were sign ins from this "K" device even following a password reset when I was the only one with the password and my sign ins are showing up separately as PC like they should.

3. In reference to my second question above: How is something other than me signing in following a password reset?  Also, is there a way to force sign out devices for an account in order to force a new sign and avoid cached sign in using old credentials?

Lastly @Comcast/Xfinity support answering this:  If you don't understand my question PLEASE DO NOT GIVE ME A CANNED ANSWER that has nothing to do with my question.  Just refer it to someone who actually knows what I am asking.  (You may be wondering why someone would feel the need to add that last part.  You SHOULD be wondering why someone would feel the need to add that.  It is because it happens seemingly more often than not.)